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� f7 <br /> 4 <br /> 8820011STI CON Woodward-Clyde Consultants <br /> t - , <br /> 6.0 SUMMARY <br /> The results of this study are summarized as follows. <br /> 65:a <br /> ` Laboratory chemical analyses of soil samples detected benzene in <br /> -° soil boring C-D from 19 to 20.5 feet (0.12 ppm) and from 29 to 30.5 <br /> 3 feet (0.06 ppm). Benzene and the remaining chemical compounds <br /> analyzed for were not detected in any of the other soil samples <br /> submitted to I.T. Corporation. <br /> • The site is immediately underlain by native soils cons*7sting <br /> 6 <br /> predominantly of interbedded clay and silt with occasional s' <br /> interbedded sand.to a depth of at least 45 feet Below grade. <br /> • At least 22 documented groundwater wells lie within a one-half mile <br /> radius of the study-site. Of the 22 documented wells. 8 wells lie <br /> downgradient of the site and one well is located in the northwest <br /> corner of the site. The closest off-site well lies approximately <br /> 500 feet to the south. <br /> Groundwater was not encountered to a depth of 45 feet while <br /> drilling. The chemical quality of the groundwater beneath the site <br /> i <br /> is unknown. Using groundwater well data from 1980, Brown and fl <br /> Caldwell (1985) indicate that the groundwater gradient beneath the ;s <br /> =- site slopes gently to the south. <br /> I <br /> i <br /> 7.0 LIMITATIONS <br /> This report was prepared within the scope outlined by Gettler-Ryan Inc. and <br /> in general accordance with the generally accepted standard of practice } <br /> — <br /> which existed in Northern California at the time the investigation was <br /> performed. The scope of the investigation was limited to the exploration ' <br /> 7 1 <br /> 4 <br /> i <br /> 0 <br />